Electron capture, excitation and ionization in He ²⁺ –H and H ⁺ –He ⁺ collisions

Abstract The wave-packet convergent close-coupling method has been applied to model electron capture, excitation and ionization processes in He 2+ –H and H + –He + collisions. These processes constitute all possible reactions taking place in a three-body system of an α particle, a proton and an electron but corresponding to two different initial states. We present systematic and convergent calculations of nl -resolved cross sections required for plasma modeling and diagnostics. The presented results are largest and most accurate to date. The integrated cross sections for electron capture, excitation and ionization show generally good agreement with experimental measurements and previous close-coupling calculations where available, however the calculated cross section for Balmer- α emission in He 2+ –H collisions significantly disagree with experiment. We also present the fully differential, as well as various doubly and singly differential cross sections for ionization in He 2+ –H collisions at an incident energy of 200 keV amu −1 .

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